The gemini:generate_content URL hook rewrites any Antigravity endpoint to
/v1internal:generateContent, but only the same-format passthrough and the two
OpenAI decision paths ever built the matching envelope. A Claude Messages or
Gemini client therefore reached the standard family planner, picked up the
rewritten URL, and posted a bare Gemini body that upstream rejects with
"Invalid JSON payload received. Unknown name \"contents\"" -- four retries
across every account, then a 503 that names none of this.
Route the standard family through the shared v1internal builder the same way
gemini_cli already is, so the URL and the body come from one decision. The
OpenAI-image-to-Gemini path cannot carry an envelope at all, so it now skips
Antigravity candidates instead of sending a request upstream can only reject.
Also stop treating a configured proxy as locally unsupported. The execution
plan carries the proxy itself, and the generic and Vertex gates moved to
transport_proxy_is_locally_supported long ago; Antigravity kept rejecting on
proxy.is_some(), which no longer matches how the local runtime executes. A
proxy that resolves to no route still disqualifies the request, and transport
profiles stay unsupported because the v1internal payload never carries one.
Co-Authored-By: Claude Opus 5 <[email protected]>
Consolidate subscription usage policy enforcement, privacy-safe persistence, and gateway security hardening into one reviewable change.
Includes bounded HTTP and execution envelopes, header and protocol guards, DNS and relay validation, authentication and secret projection hardening, secure backup/install paths, and regression coverage.
elky